Web Development and Design Foundations with XHTML, 5th Edition

(^624) Appendix D Comparison of HTML 4, XHTML, and HTML 5
HTML 5 (XHTML Syntax)

D.4 Quotation Marks with Attributes

The XHTML standard requires that the values for all attributes are enclosed in quotation

marks. This was valid in HTML 4, but not always done.

HTML 4

<P ID=article>

XHTML

<p id="article">

HTML 5 (HTML syntax)

Either <p id=article>or <p id="article">

HTML 5 (XHTML syntax)

<p id="article">

D.5 Container Tags

The XHTML standard requires that both the opening and closing tags for all container

tags are used. HTML 4 does not require this.

HTML 4

<p>This is the first paragraph.

<p>This is the second paragraph.

XHTML

<p>This is the first paragraph.</p>

<p>This is the second paragraph.</p>

HTML 5 (HTML Syntax)

<p>This is the first paragraph.

<p>This is the second paragraph.